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Ullujaya, Chilcatay Formation (Miocene of Peru)

Where: Peru (14.6° S, 75.6° W: paleocoordinates 15.5° S, 71.5° W)

• coordinate stated in text

When: Chilcatay Formation, Burdigalian (20.4 - 16.0 Ma)

• Chilcatay Formation, latest Oligocene to early Miocene (Dunbar et al. 1990; DeVries 1998, 2001). Although the precise locality of the holotype is unknown, the referred specimen MUSM 1401 originates from within the Chilcatay Formation, several meters under the Chilcatay Formation - Pisco Formation disconformity, at Ullujaya, a few kilometers north to the type locality. Based on a published section a short distance from Ullujaya, the Chilcatay Formation layers of this locality (which preserves the fossilized remains of other marine vertebrates including mysticetes, kentriodontids, the squalodelphinids Huaridelphis raimondii Lambert, Bianucci & Urbina, 2014 and Notocetus vanbenedeni Moreno, 1892, and a stem physeteroid) are tentatively dated to the early Miocene (Alván De la Cruz 2008; Lambert et al. 2014; Bianucci et al. 2015).

• bed-level stratigraphic resolution

Environment/lithology: marine; diatomaceous siltstone and sandstone

• See Di Celma et al 2018.

•The Chilcatay Formation comprises marine diatomaceous and tuffaceous sandy siltstones, bioclastic sandstones and, along the base, massive sandstones, and large boulders of crystalline basement rocks.

Size class: macrofossils

Primary reference: O. Lambert, C. de Muizon, and G. Bianucci. 2015. A new archaic homodont toothed cetacean (Mammalia, Cetacea, Odontoceti) from the early Miocene of Peru. Geodiversitas 37(1):79-108 [M. Uhen/M. Uhen/M. Uhen] more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 167732: authorized by Mark Uhen, entered by Mark Uhen on 30.03.2015

Creative Commons license: CC BY (attribution)